Cho, Joong-Yeon and Byeon, Kyeong-Jae and Park, Hyoungwon and Kim, Jinseung and Kim, Hyeong-Seok and Lee, Heon (2011) Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures. NANOSCALE RESEARCH LETTERS, 6 (1). pp. 1-6. ISSN 1931-7573 (Print) 1556-276X (Online)
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Official URL: http://www.nanoscalereslett.com/content/6/1/578
A micro- and nanoscale complex structure made of a high refractive index polymer (n = 2.08) was formed on the ITO electrode layer of an edge-emitting type GaN blue light-emitting diode (LED), in order to improve the photon extraction efficiency by suppressing total internal reflection of photons. The nanoimprint lithography process was used to form the micro- and nanoscale complex structures, using a polymer resin with dispersed TiO2 nano-particles as an imprint resin. Plasma processing, such as reactive ion etching, was used to form the micro- and nano-scale complex structure; thus, plasma-induced damage to the LED device can be avoided. Due to the high refractive index polymeric micro- and nanostructure on the ITO layer, the electroluminescence emission was increased up to 20%, compared to an identical LED that was grown on a patterned sapphire substrate to improve photon extraction efficiency.
|Subjects:||Physical Science > Photonics|
|Deposited By:||M T V|
|Deposited On:||05 Jan 2012 09:42|
|Last Modified:||05 Jan 2012 09:42|
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